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用数值计算分析了采用实时拟动力试验方法研究滑移摩擦隔震装置的可行性。重点考察了拉格朗日插值方法对作动器位移与速度精确度的影响。通过对一个七个自由度结构模型设置滑移摩擦隔震支座动力反应时程的分析可知,用实时拟动力试验系统研究滑移摩擦类隔震结构是可行的。通常当Δt=0.01s,δt=0.001s时,SGT外插值运算的次数不应超过五次,内插值的运算次数可以不受限制。宜采用三阶拉格朗日插值计算公式,以控制动力反应速度失真及突变速度的大小。在进行实时拟动力试验时必须考虑作动器系统位移滞后的影响,标定滞后时段长度,并在编制控制程序时予以补偿。
The feasibility of using the real-time quasi-dynamic test method to study the sliding friction isolation device was analyzed by numerical calculation. The influence of Lagrange interpolation method on actuator displacement and speed accuracy is mainly studied. By analyzing the dynamic response time history of a sliding friction isolator with a structure of seven degrees of freedom, it is feasible to study the sliding friction type isolated structure with the real-time quasi-dynamic test system. Generally, when Δt = 0.01s, δt = 0.001s, the number of extrapolation operations of SGT should not exceed five times, and the number of interpolation operations can be unlimited. Third-order Lagrange interpolation formula should be used to control the speed of dynamic response distortion and mutation speed. The effects of the actuator system displacement hysteresis must be considered in real-time quasi-dynamic tests, the length of the hysteresis is to be calibrated and compensated in the preparation of the control program.